For Voice communications via the Internet is a very complicated system engineering, its application is very wide, therefore involves technology is also much more special, one of the most fundamental technology is VoIP (Voice over IP) technology, it can be said that the Internet Voice communication is one of the most typical of VoIP technology, also is the most promising applications, so before discussing use the Internet for Voice communication, it is necessary to first analyze the basic principle of VoIP, as well as the related technical problems in VoIP,
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